public bool DeleteEvent(long calendarId, string uid)
        {
            var id = calendarId;

            if (CalendarManager.GetEvent(uid).Organizer.CommonName != id.ToString())
            {
                return(false);
            }

            DatabaseManager.ExecuteNonQuery($"DELETE FROM Veranstaltungen WHERE Uid=\"{uid}\"");
            CalendarManager.DeleteEvent(Convert.ToInt64(id), uid);
            return(true);
        }